Add fingerprint (local_auth) session + 3-min inactivity timeout (default), activity resets timer, settings: biometric toggle + timeout picker

lib/main.dart

@@ -11,26 +11,39 @@ void main() async {
   final theme = ThemeProvider();
   final registered = await auth.isRegistered();
   final email = await auth.getEmail() ?? '';
+  final timeout = await auth.getTimeoutMinutes();
+  final hasSession = await auth.hasValidSession(timeout);
+  final startAtDashboard = registered && email.isNotEmpty && hasSession;
   runApp(
     MultiProvider(
       providers: [
         Provider<AuthService>.value(value: auth),
         ChangeNotifierProvider<ThemeProvider>.value(value: theme),
       ],
-      child: MyApp(registered: registered, email: email),
+      child: MyApp(
+        startAtDashboard: startAtDashboard,
+        auth: auth,
+        theme: theme,
+        email: email,
+      ),
     ),
   );
 }
 
 class MyApp extends StatelessWidget {
-  final bool registered;
+  final bool startAtDashboard;
+  final AuthService auth;
+  final ThemeProvider theme;
   final String email;
-  const MyApp({super.key, required this.registered, required this.email});
+  const MyApp(
+      {super.key,
+      required this.startAtDashboard,
+      required this.auth,
+      required this.theme,
+      required this.email});
 
   @override
   Widget build(BuildContext context) {
-    final theme = Provider.of<ThemeProvider>(context);
-    final auth = Provider.of<AuthService>(context, listen: false);
     return MaterialApp(
       title: 'Login Vault',
       theme: ThemeData(
@@ -44,8 +57,7 @@ class MyApp extends StatelessWidget {
         colorSchemeSeed: Colors.indigo,
       ),
       themeMode: theme.mode,
-      // decide home: if registered AND email known -> Dashboard, else Auth.
-      home: (registered && email.isNotEmpty)
+      home: startAtDashboard
           ? DashboardScreen(auth: auth, theme: theme, email: email)
           : AuthScreen(auth: auth),
       debugShowCheckedModeBanner: false,